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Methods and systems for designing and/or selecting drilling equipment using predictions of rotary drill bit walkRelated Patent Categories: Data Processing: Structural Design, Modeling, Simulation, And Emulation, Simulating Nonelectrical Device Or System, Fluid, Well Or ReservoirMethods and systems for designing and/or selecting drilling equipment using predictions of rotary drill bit walk description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070192074, Methods and systems for designing and/or selecting drilling equipment using predictions of rotary drill bit walk. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED APPLICATION [0001] This application is a U.S. Continuation-In-Part of U.S. patent application Ser. No. 11/462,898 filed Aug. 7, 2006, and entitled "Methods and Systems for Designing and/or Selecting Drilling Equipment Using Predictions of Rotary Drill Bit Walk," which claims the benefit of U.S. provisional patent Application entitled "Methods and Systems of Rotary Drill Bit Steerability Prediction, Rotary Drill Bit Design and Operation," application Ser. No. 60/706,321 filed Aug. 8, 2005. [0002] This application claims the benefit of provisional patent application entitled "Methods and Systems of Rotary Drill Bit Walk Prediction, Rotary Drill Bit Design and Operation," application Ser. No. 60/738,431 filed Nov. 21, 2005. [0003] This application claims the benefit of provisional patent application entitled "Methods and Systems of Rotary Drill Bit Walk Prediction, Rotary Drill Bit Design and Operation," application Ser. No. 60/706,323 filed Aug. 8, 2005. [0004] This application claims the benefit of provisional patent application entitled "Methods and Systems of Rotary Drill Bit Steerability Prediction, Rotary Drill Bit Design and Operation," application Ser. No. 60/738,453 filed Nov. 21, 2005. TECHNICAL FIELD [0005] The present disclosure is related to wellbore drilling equipment and more particularly to designing rotary drill bits and/or bottom hole assemblies with desired bit walk characteristics or selecting a rotary drill bit and/or components for an associated bottom hole assembly with desired bit walk characteristics from existing designs. BACKGROUND [0006] Various types of rotary drill bits have been used to form wellbores or boreholes in downhole formations. Such wellbores are often formed using a rotary drill bit attached to the end of a generally hollow, tubular drill string extending from an associated well surface. Rotation of a rotary drill bit progressively cuts away adjacent portions of a downhole formation by contact between cutting elements and cutting structures disposed on exterior portions of the rotary drill bit. Examples of rotary drill bits include fixed cutter drill bits or drag drill bits and impregnated diamond bits. Various types of drilling fluids are often used in conjunction with rotary drill bits to form wellbores or boreholes extending from a well surface through one or more downhole formations. [0007] Various types of computer based systems, software applications and/or computer programs have previously been used to simulate forming wellbores including, but not limited to, directional wellbores and to simulate the performance of a wide variety of drilling equipment including, but not limited to, rotary drill bits which may be used to form such wellbores. Some examples of such computer based systems, software applications and/or computer programs are discussed in various patents and other references listed on Information Disclosure Statements filed during prosecution of this patent application. SUMMARY [0008] In accordance with teachings of the present disclosure, rotary drill bits including fixed cutter drill bits may be designed with bit walk characteristics and/or controllability optimized for a desired wellbore profile and/or anticipated downhole drilling conditions. Alternatively, a rotary drill bit including a fixed cutter drill bit with desired bit walk and/or controllability may be selected from existing drill bit designs. [0009] Rotary drill bits designed or selected to form a straight hole or vertical wellbore may require approximately zero or neutral bit walk. Rotary drill bits designed or selected for use with a directional drilling system may have an optimum bit walk rate for a desired wellbore profile and/or anticipated downhole drilling conditions. For some embodiments rotary drill bits may be designed or selected from existing designs with a long gage having an optimum length. [0010] One aspect of the present disclosure may include procedures to evaluate walk tendency of a rotary drill bit under a combination of bit motions including, but not limited to, rotation, axial penetration, side penetration, tilt rate and/or transition drilling. For example, methods and systems incorporating teachings of the present disclosure may be used to simulate drilling through inclined formation interfaces and complex formations with hard stringers disposed in softer formation materials and/or alternating layers of hard and soft formation materials. Methods and systems incorporating teachings of the present disclosure may also be used to simulate drilling a wellbore having an inside diameter greater than expected based on bit size or gage dimensions or a rotary drill bit used to form the wellbore. [0011] Drilling a wellbore profile, trajectory, or path using a wide variety of rotary drill bits and bottom hole assemblies may be simulated in three dimensions (3D) using methods and systems incorporating teachings of the present disclosure. Such simulations may be used to design rotary drill bits and/or bottom hole assemblies with optimum bit walk characteristics for drilling a wellbore profile. Such simulation may also be used to select a rotary drill bit and/or components for an associated bottom hole assembly from existing designs with optimum bit walk characteristics for drilling a wellbore profile. [0012] Systems and methods incorporating teachings of the present disclosure may be used to simulate drilling various types of wellbores and segments of wellbores using either push-the-bit directional drilling systems or point-the-bit directional drilling systems. BRIEF DESCRIPTION OF THE DRAWINGS [0013] A more complete and thorough understanding of the present disclosure and advantages thereof may be acquired by referring to the following description taken in conjunction with the accompanying drawings, in which like reference numbers indicate like features, and wherein: [0014] FIG. 1A is a schematic drawing in section and in elevation with portions broken away showing one example of a directional wellbore which may be formed by a drill bit designed in accordance with teachings of the present disclosure or selected from existing drill bit designs in accordance with teachings of the present disclosure; [0015] FIG. 1B is a schematic drawing showing a graphical representation of a directional wellbore having a constant bend radius between a generally vertical section and a generally horizontal section which may be formed by a drill bit designed in accordance with teachings of the present disclosure or selected from existing drill bit designs in accordance with teachings of the present disclosure; [0016] FIG. 1C is a schematic drawing showing one example of a system and associate apparatus operable to simulate drilling a complex, directional wellbore in accordance with teachings of the present disclosure; [0017] FIG. 2A is a schematic drawing showing an isometric view with portions broken away of a rotary drill bit with six (6) degrees of freedom which may be used to describe motion of the rotary drill bit in three dimensions in a bit coordinate system; [0018] FIG. 2B is a schematic drawing showing forces applied to a rotary drill bit while forming a substantially vertical wellbore; [0019] FIG. 3A is a schematic representation showing a side force applied to a rotary drill bit at an instant in time in a two dimensional Cartesian bit coordinate system. 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